Cyclic Fluctuations in Kīlauea's Summit Eruptive Vigor

Cyclic fluctuations in eruptive vigor were present recently at the western fissure in Halema‘uma‘u, at the summit of Kīlauea. The cycles occurred on January 22 and 23, with cycles lasting 5-6 minutes. Peaks in the cycles were expressed as high flow rates in the channel and spattering at the vents. During troughs in the cycles, the channel became nearly inactive. These variations may be due to oscillations in the height of the lava column in the vent. The video is shown at 90x speed.